Plastic extruder and its extrusion head

Abstract

The utility model provides a plastic extruder and an extrusion head thereof. The purpose is to solve the technical problem that the existing plastic extruder needs to be equipped with a plastic pelletizer separately, resulting in high equipment cost and large space occupied by the production line. The technical scheme adopted is: an extrusion head, including: a template with an extrusion hole, a first gear located on the inner side of the template, a first transmission shaft coaxially connected to the first gear and passing through the template, a cutter located on the outer side of the template and connected to the first transmission shaft, a second gear forming a transmission connection with the first gear, and a second transmission shaft coaxially connected to the second gear; the second transmission shaft has a joint at one end away from the second gear to connect the screw of the plastic extruder. The extrusion head can automatically cut the extruded strip plastic into plastic pellets with the help of the power of the screw, which can make the production line more compact and help reduce equipment costs. In addition, the utility model also provides a plastic extruder with the above-mentioned extrusion head.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic extrusion equipment, in particular to a plastic extruder and an extrusion head thereof. Background Art

[0002] Plastic extruder is an important equipment for plastic production and processing, which includes components such as screw, barrel, hopper, die head, etc. The plastic is plasticized into a uniform melt through the extrusion system, and is continuously extruded out of the die head by the screw under the pressure built up in the process.

[0003] When a plastic extruder is used to modify plastic, the modified plastic will be continuously extruded in the form of strips. The prior art often uses a separate plastic pelletizer to cut the continuously extruded strip plastic into plastic pellets. The price of a plastic pelletizer is not cheap. Adding a separate plastic pelletizer will increase the equipment cost and lengthen the production line, requiring more space in the workshop. Summary of the invention

[0004] The purpose of the utility model is to provide an extrusion head, which is installed at the extrusion end of a plastic extruder and can automatically cut the extruded strip plastic into plastic particles by the power of the screw, so as to make the production line more compact and help reduce equipment costs. Based on the same inventive concept, another purpose of the utility model is to provide a plastic extruder having the above-mentioned extrusion head.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] An extrusion head includes: a template with an extrusion hole, a first gear located inside the template, a first transmission shaft coaxially connected to the first gear and passing through the template, a cutter located outside the template and connected to the first transmission shaft, a second gear forming a transmission connection with the first gear, and a second transmission shaft coaxially connected to the second gear; wherein the second transmission shaft has a joint at one end away from the second gear to connect to the screw of a plastic extruder.

[0007] Optionally, it also includes a mounting block; the mounting block is detachably mounted on the extrusion end of the plastic extruder; the mounting block is provided with a mounting groove on the inner side for installing the template, the first gear, and the second gear; the mounting block has an extrusion port extending from the mounting groove to the outside, and the template block is arranged at the extrusion port.

[0008] Optionally, the first gear and the second gear are mounted on a gear box, and the gear box is detachably mounted in a mounting groove of a mounting block.

[0009] Optionally, the gearbox includes: a box body, and a box cover that is detachably connected to the box body and forms a closed box body; the first transmission shaft passes through the box cover and is rotatably connected to the box cover via a first sealed bearing; the second transmission shaft passes through the box body and is rotatably connected to the box body via a second sealed bearing.

[0010] Optionally, the gearbox is provided with a seal between the box body and the box cover.

[0011] Optionally, the cutter includes: a central portion, an outer ring portion, and a knife body radiating from the central portion to the outer ring portion; the knife body is provided with a plurality of knife bodies, which are evenly distributed along the circumferential direction of the outer ring portion.

[0012] Optionally, the protruding end of the first transmission shaft is connected to the central part of the cutter by a bolt; one of the first transmission shaft and the cutter is provided with a limiting groove on the opposite surface, and the other is provided with a limiting protrusion on the opposite surface to prevent the two from rotating relative to each other.

[0013] Optionally, the mounting block has an insertion and extraction hole extending from the mounting groove to the outer surface for inserting and extracting the template.

[0014] Optionally, the mounting block has a notch extending from the mounting groove to the outer surface, and a placeholder block is installed in the notch; a gap constituting an insertion and extraction hole is provided between the placeholder block and the mounting block.

[0015] The present application also provides a plastic extruder, which has an extrusion head with the aforementioned structure.

[0016] The working principle of the utility model is: the extruder head is installed at the extrusion end of the plastic extruder, so that the second transmission shaft is connected with the screw of the plastic extruder. When the screw of the plastic extruder rotates, it will drive the second transmission shaft to rotate; the second transmission shaft will drive the second gear to rotate, the second gear will drive the first gear to rotate, the first gear will drive the first transmission shaft to rotate, and the first transmission shaft will drive the cutter to rotate; the strip plastic extruded from the extrusion hole of the template will be automatically cut into plastic particles by the rotating cutter.

[0017] It can be seen that the beneficial effects of the utility model are: the extruded strip plastic can be automatically cut into plastic particles with the help of the power of the screw; in this way, there is no need to add a separate plastic pelletizer, which can make the production line more compact and help reduce equipment costs; in addition, the plastic is cut just when it is extruded from the extrusion hole of the template, and the plastic is softer at this time, which can make cutting more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the extrusion head;

[0020] Figure 2 for Figure 1 Schematic diagram from another angle;

[0021] Figure 3 This is a schematic diagram of the assembly of the extruder head;

[0022] Figure 4 Schematic diagram of the extrusion head installed at the extrusion end of a plastic extruder.

[0023] Figure numerals: 1. template; 2. first gear; 3. first transmission shaft; 4. cutter; 5. second gear; 6. second transmission shaft; 7. mounting block; 8. extrusion port; 9. gear box; 10. box body; 11. box cover; 12. cutter body; 13. placeholder block; 14. joint. DETAILED DESCRIPTION

[0024] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0025] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0028] The following is combined with Figure 1 ~Attached Figure 4 The embodiments of the present utility model are described in detail.

[0029] The embodiment of the utility model provides an extrusion head. The extrusion head comprises: a template 1 having an extrusion hole, a first gear 2 located inside the template 1, a first transmission shaft 3 coaxially connected to the first gear 2 and passing through the template 1, a cutter 4 located outside the template 1 and connected to the first transmission shaft 3, a second gear 5 connected to the first gear 2 in a transmission connection, and a second transmission shaft 6 coaxially connected to the second gear 5. It should be understood that the inside of the template 1 refers to the side facing the plastic extruder, and the outside of the template 1 refers to the side facing away from the plastic extruder. The first transmission shaft 3 passes through the template 1, which means that one end of the first transmission shaft 3 is located on the side of the template 1 facing the plastic extruder, and the other end is located on the side of the template 1 facing away from the plastic extruder. The second transmission shaft 6 has a joint 14 at one end away from the second gear 5 to connect the screw of the plastic extruder. It should be understood that the second transmission shaft 6 can be connected to the screw of the plastic extruder by spline connection, profile connection, key connection, etc., and it is only necessary to machine a mounting groove matching the joint 14 of the second transmission shaft 6 at the end of the screw. The specific connection method can be determined according to the actual situation and processing difficulty.

[0030] The specific implementation method of the extruder head is described below. The extruder head is installed at the extrusion end of the plastic extruder so that the second transmission shaft 6 is connected to the screw of the plastic extruder. When the screw of the plastic extruder rotates, it will drive the second transmission shaft 6 to rotate; the second transmission shaft 6 will drive the second gear 5 to rotate, the second gear 5 will drive the first gear 2 to rotate, the first gear 2 will drive the first transmission shaft 3 to rotate, and the first transmission shaft 3 will drive the cutter 4 to rotate; the strip plastic extruded from the extrusion hole of the template 1 will be automatically cut into plastic particles by the rotating cutter 4. The extruder head can automatically cut the extruded strip plastic into plastic particles with the help of the power of the screw; in this way, there is no need to add a separate plastic pelletizer, which can make the production line more compact and help reduce equipment costs; in addition, the plastic is cut when it is just extruded from the extrusion hole of the template 1, and the plastic is softer at this time, which can make cutting more labor-saving.

[0031] Furthermore, it also includes a mounting block 7; the mounting block 7 is detachably mounted on the extrusion end of the plastic extruder; the mounting block 7 is provided with a mounting groove on the inner side for mounting the template 1, the first gear 2, and the second gear 5; the mounting block 7 has an extrusion port 8 extending from the mounting groove to the outer side, and the template 1 is blocked at the extrusion port 8. It should be understood that the inner side of the mounting block 7 refers to the side thereof facing the plastic extruder, and the outer side of the mounting block 7 refers to the side thereof facing away from the plastic extruder.

[0032] Further, the first gear 2 and the second gear 5 are mounted on a gear box 9, and the gear box 9 is detachably mounted in a mounting groove of a mounting block 7. It should be understood that the gear box 9 can be connected to the mounting block 7 by bolts. A gap is left between the gear box 9 and the template 1 for the molten plastic to pass through.

[0033] Further, the gear box 9 includes: a box body 10, a box cover 11 which is detachably connected to the box body 10 and forms a seal for the box body 10; the first transmission shaft 3 passes through the box cover 11 and is rotatably connected to the box cover 11 through a first sealed bearing; the second transmission shaft 6 passes through the box body 10 and is rotatably connected to the box body 10 through a second sealed bearing. It should be understood that the box body 10 and the box cover 11 can be connected by bolts. Installing the first gear 2 and the second gear 5 in the sealed gear box 9 can reduce resistance and prevent the molten plastic from affecting the power transmission from the second gear 5 to the first gear 2, so that the cutter 4 can operate more stably and reliably.

[0034] Furthermore, the gear box 9 is provided with a seal between the box body 10 and the box cover 11. It should be understood that the seal made of a high temperature resistant material can be selected.

[0035] Furthermore, the cutter 4 comprises: a central portion, an outer ring portion, and a blade body 12 radiating from the central portion to the outer ring portion; the blade body 12 is provided in plurality and evenly distributed along the circumferential direction of the outer ring portion. It should be understood that setting the cutter 4 into the aforementioned structure can make it have higher strength and avoid deformation.

[0036] Furthermore, the protruding end of the first transmission shaft 3 is connected to the central part of the cutter 4 by bolts; one of the first transmission shaft 3 and the cutter 4 is provided with a limiting groove on the opposite surface, and the other is provided with a limiting protrusion on the opposite surface to prevent the two from rotating relative to each other. It should be understood that a non-circular limiting groove can be provided on the end surface of the first transmission shaft 3, and a matching limiting protrusion can be provided on the side of the cutter 4 facing the first transmission shaft 3; or a non-circular limiting groove can be provided on the side of the cutter 4 facing the first transmission shaft 3, and a matching limiting protrusion can be provided on the end surface of the first transmission shaft 3; to avoid the cutter 4 from rotating relative to the first transmission shaft 3 due to the resistance of the plastic when cutting the plastic, and to prevent the bolts connecting the cutter 4 and the first transmission shaft 3 from loosening.

[0037] Furthermore, the mounting block 7 has an insertion hole extending from the mounting groove to the outer surface for inserting and removing the template 1. It should be understood that the insertion hole is provided on the mounting block 7, and the template 1 can be replaced by inserting and removing, which is more convenient. The insertion hole usually extends from the mounting groove to the outer surface of the upper side of the mounting block 7.

[0038] Furthermore, the mounting block 7 has a notch extending from the mounting groove to the outer surface, and a placeholder block 13 is installed in the notch; a gap constituting an insertion and extraction hole is provided between the placeholder block 13 and the mounting block 7 .

[0039] The embodiment of the utility model also provides a plastic extruder, which has an extrusion head with the above-mentioned structure.

[0040] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.

Claims

1. Extrusion head, characterized in that, include: A template (1) having an extrusion hole; and A first gear (2) located inside the template (1); and a first transmission shaft (3) coaxially connected to the first gear (2) and extending through the template (1); and a cutter (4) located outside the template (1) and connected to the first transmission shaft (3); and a second gear (5) in transmission connection with the first gear (2); and a second transmission shaft (6) coaxially connected to the second gear (5); in, The end of the second transmission shaft (6) away from the second gear (5) has a joint (14) for connecting to a screw of a plastic extruder.

2. The extrusion head according to claim 1, characterized in that: It also includes a mounting block (7); the mounting block (7) is detachably mounted on the extrusion end of the plastic extruder; The mounting block (7) is provided with a mounting groove on its inner side for mounting the template (1), the first gear (2), and the second gear (5); The mounting block (7) has an extrusion opening (8) extending from the mounting groove to the outside, and the template (1) is arranged at the extrusion opening (8).

3. The extrusion head according to claim 2, characterized in that: The first gear (2) and the second gear (5) are mounted on a gear box (9), and the gear box (9) is detachably mounted in a mounting groove of a mounting block (7).

4. The extrusion head according to claim 3, characterized in that: The gear box (9) comprises: a box body (10), and a box cover (11) detachably connected to the box body (10) and sealing the box body (10); The first transmission shaft (3) passes through the box cover (11) and is rotatably connected to the box cover (11) via a first sealed bearing; The second transmission shaft (6) passes through the housing (10) and is rotationally connected to the housing (10) via a second sealed bearing.

5. The extrusion head according to claim 4, characterized in that: The gear box (9) is provided with a sealing member between the box body (10) and the box cover (11).

6. The extrusion head according to any one of claims 1 to 5, characterized in that: The cutting knife (4) comprises: a central portion, an outer ring portion, and a knife body (12) radiating from the central portion to the outer ring portion; The knife bodies (12) are provided in plurality and are evenly distributed along the circumferential direction of the outer ring portion.

7. The extrusion head according to claim 6, characterized in that: The protruding end of the first transmission shaft (3) is connected to the central part of the cutter (4) via a bolt; One of the first transmission shaft (3) and the cutter (4) is provided with a limiting groove on the opposite surface, and the other is provided with a limiting protrusion on the opposite surface, so as to prevent the two from rotating relative to each other.

8. The extrusion head according to any one of claims 2 to 5, characterized in that: The mounting block (7) has an insertion and extraction hole extending from the mounting groove to the outer surface for inserting and extracting the template (1).

9. The extrusion head according to claim 8, characterized in that: The mounting block (7) has a notch extending from the mounting groove to the outer surface, and a placeholder block (13) is installed in the notch; a gap forming an insertion and extraction hole is provided between the placeholder block (13) and the mounting block (7).

10. Plastic extruder, characterized in that: An extrusion head according to any one of claims 1 to 9.

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